Any opinions on the DMW magazine extensions?

Anyone have any experience with the DMW… Dave’s Metal Works magazine extensions?

My Google fu is weak and I can’t seem to find anything on these parts. Found em for sale at Speed Shooters International, but no info about the product and have just recently even heard the name.

In particular I’m looking for a +4 and wanted to know more about this as an alternative to the Nordic or Choate.

Your thoughts.

I have been using one of Dave’s tubes on my Benelli M1 tactical for a few years now. I have had no issues at all, and consider it to be a quality piece.

Thank you.

Are they steel or aluminum? Doesn’t say much about them at all on the different websites.

I’ve been using one on my M4 for a few years without any issues. According to his website, the extensions are carbon steel, and the replacement tube is crome-moly.

http://www.davesmetalworks.com/ben4.htm

Mine is steel.